Hi My name is Erica. I am currently doing a study on wearable devices for my dissertation for my master's degree. In order to complete my dissertation, I have to carry out a survey of people who use wearable devices to monitor their health and fitness. All responses will be done anonymously...

I have just got a jawbone up24, yesterday was the first day I used it. But it didn't seem to track my sleep properly. I put it in sleep mode when I got into bed and obviously turned it off when I woke. But it tells me I've been in bed for over 12 hours, when I hadn't. Is there a problem...